9TH OCTOBER.--Once more I rode into the lower country a few miles, to take a sketch of another remarkable hill. In the afternoon I examined the sandstone caverns in the hill opposite to our camp; some very curious organic remains having been found there by one of the party during my absence. I found that these occurred on the lower side of sandstone strata, and that they had become denuded by the decomposition of sandstone underneath. We were to leave this camp next morning. The men were on very reduced rations, and I was apprehensive that we might be disappointed in our search for water in many places where we had before encamped and found it. In the afternoon, the sky became suddenly overcast, distant thunder was heard; and the southern portion of the heavens, over the country to which we were about to return, was evidently discharging some heavy rain there. At twilight, the rain commenced to fall heavily at our camp, and continued to do so during four hours. Such a supply came most opportunely for us, and, although I could not be so vain as to suppose that the thunder rolled only for our benefit alone, I felt as thankful as though it had. This day I saw on the cavernous hill the woolly ACTINOTUS HELIANTHI, one of the most singular of umbelliferous plants; and, on descending to the base, a white variety of the COMESPERMA SYLVESTRIS, with smooth branches: unlike the kind observed in September, it did not grow above one foot high. A small shrub grew on the rocks, a pretty little Calytrix, near C. MICROPHYLLA A Cunn. (from Port Essington and Melville Island); but the branches, with their leaves, are more stout, and the bracts more obtuse. Sir W. Hooker supposes it to be a new species. We here found this day a woolly-leaved plant, with long branching panicles of brilliantly blue flowers, which Professor de Vriese has ascertained to be a new genus of the natural order of Goodeniads, and which he calls LINSCHOTENIA DISCOLOR.[*] Thermometer, meter, at sunrise, 60 deg.; at noon, 94 deg.; at 4 P. M., 76 deg.; at 9, 64 deg.;--with wet bulb, 64 deg.. [* LINSCHOTENIA DE VRIESE. Calyx superus, limbo obsoleto. Corollae quinquefidae tubo hine fisso, lobis majoribus margine utroque auriculato- crispis, alatisve, duobus minoribus lanceolatis, interne appendice proprio cuculliformi instructis. Antherae imberbes, cohaerentes. Filamenta libera, quandoque subflexuosa. Ovarium uniovulatum; stylus inflexus; stigmatis indusium ore nudum; semen in nuce solitarium. Genus dicatum Jano Huigenio Linschotenio, geographo, navarcho, itineratori seculi XVI., qui historiae naturalis, imprimis vero geographiae et rei nauticae progressui eximie profuit. Linschotenia Dampierae proxime habitu et plurimis cum floris, tum habitus characteribus, paracolla cuculliforme ab omnibus Goodeniacearum generibus huc usque cognitis, diversa.